#include <iostream>

using namespace std;

class TV
{
public:
	int channel;
	int volumeLevel;
	bool on;

	TV()
	{
		channel = 1;
		volumeLevel = 1;
		on = false;
	}

	void turnOn()
	{
		on = true;
	}

	void turnOff()
	{
		on = false;
	}

	void setChannel(int newChannel)
	{
		if (on && newChannel >= 1 && newChannel <= 120)
			channel = newChannel;
	}

	void setVolume(int newVolumeLevel)
	{
		if (on && newVolumeLevel >= 1 && newVolumeLevel <=  7)
			volumeLevel = newVolumeLevel;
	}

	void volumeUp()
	{
		if (on && volumeLevel < 7)
			volumeLevel++;
	}

	void channelUp()
	{
		if (on && channel < 7)
			channel++;
	}

	void channelDown()
	{
		if (on && volumeLevel > 1)
			volumeLevel--;
	}
};

int main()
{
	TV tv1;
	tv1.turnOn();
	tv1.setChannel(30);
	tv1.setVolume(3);

	TV tv2;
	tv2.turnOn();
	tv2.channelUp();
	tv2.channelUp();
	tv2.volumeUp();

	cout << "tv1's channel is " << tv1.channel << " and volume level is " << tv1.volumeLevel << endl;
	cout << "tv2's channel is " << tv2.channel << " and volume level is " << tv2.volumeLevel << endl;

	return 0;
}

